DOBI is a digital asset trading platform. Apart from the English version, the website has also Chinese and Portugese versions. 

QuadrigaCX is a Centralized cryptocurrency exchange based in the Canada. The exchange was launched in 2013. Its reported volume is about 0 $ as for 8 October 2019.
QuadrigaCX has 0 available trading pairs and 0 coins. Deposits are Depends on currency and volume on the exchange.
QuadrigaCX have Fiat...

Chinese platform FCoin announced in February, 2020 that the exchange will stop its operation. A founder of the exchange explained this decision by internal errors.  FCoin still owes its users the amount from 7.000 to 13.000 BTC. 

BuyUcoin is the most trusted & advanced digital currency exchange in India. The service supports a variety of features and products to easily buy, sell, trade, and store cryptocurrencies. With over 350,000+ customers that vouch for the ease with which BuyUcoin enables digital asset trading. The service's mission is to bring cryptocurrencies in a million Indian pockets. 

Update: It seems like the CoinMex exchange shut down, possibly exit scammed.
CoinMex provides access to BTC, ETH, USDT and NEO markets. The company was incorporated under the legislation of the Republic of Seychelles in 2018 and is affiliated with NEWEX Technology Co. Ltd. CoinMex is focused on the Chinese market. 

Coinrate is currently inactive. The exchange’s website does not display any active orders in the trading window. The social media channels of the company had not been updated for about 2 years. Initially, Coinrate offered fiat currencies as well as Bitcoin and Fargocoin as the main currencies in trading pairs.

It became known in spring 2019 that Gatecoin exchange would stop its operation. It was stipulated by the decision of the Hong Kong court after quite a long attempt to recover lost funds. The loss amounted to $2 mln.